/**
 _ _____           _          _     _
 | |  __ \         (_)        | |   | |
 ___ ___ | | |__) |___  ___ _ ______ _| |__ | | ___
 / __/ _ \| |  _  // _ \/ __| |_  / _` | '_ \| |/ _ \
 | (_| (_) | | | \ \  __/\__ \ |/ / (_| | |_) | |  __/
 \___\___/|_|_|  \_\___||___/_/___\__,_|_.__/|_|\___|
 
 v1.6 - jQuery plugin created by Alvaro Prieto Lauroba
 
 Licences: MIT & GPL
 Feel free to use or modify this plugin as far as my full name is kept
 
 If you are going to use this plug-in in production environments it is
 strongly recommended to use its minified version: colResizable.min.js
 
 */

(function ($) {
	
	var d = $(document); 		//window object
	var h = $("head");			//head object
	var drag = null;			//reference to the current grip that is being dragged
	var tables = {};			//object of the already processed tables (table.id as key)
	var count = 0;				//internal count to create unique IDs when needed.
	
	//common strings for packing
	var ID = "id";
	var PX = "px";
	var SIGNATURE = "JColResizer";
	var FLEX = "JCLRFlex";
	
	//short-cuts
	var I = parseInt;
	var M = Math;
	var ie = navigator.userAgent.indexOf('Trident/4.0') > 0;
	var S;
	try {
		S = sessionStorage;
	} catch (e) {
	}	//Firefox crashes when executed as local file system
	
	//append required CSS rules
	//h.append("<style type='text/css'>  .JColResizer{table-layout:fixed;} .JColResizer > tbody > tr > td, .JColResizer > tbody > tr > th{overflow:hidden;padding-left:0!important; padding-right:0!important;}  .JCLRgrips{ height:0px; position:relative;} .JCLRgrip{margin-left:-5px; position:absolute; z-index:5; } .JCLRgrip .JColResizer{position:absolute;background-color:red;filter:alpha(opacity=1);opacity:0;width:10px;height:100%;cursor: e-resize;top:0px} .JCLRLastGrip{position:absolute; width:1px; } .JCLRgripDrag{ border-left:1px dotted black;	} .JCLRFlex{width:auto!important;} .JCLRgrip.JCLRdisabledGrip .JColResizer{cursor:default; display:none;}</style>");
	h.append("<style type='text/css'>   .JCLRgrips{ height:0px; position:relative;} .JCLRgrip{margin-left:-5px; position:absolute; z-index:5; } .JCLRgrip .JColResizer{position:absolute;background-color:red;filter:alpha(opacity=1);opacity:0;width:10px;height:100%;cursor: e-resize;top:0px} .JCLRLastGrip{position:absolute; width:1px; } .JCLRgripDrag{ border-left:1px dotted black;	} .JCLRFlex{width:auto!important;} .JCLRgrip.JCLRdisabledGrip .JColResizer{cursor:default; display:none;}</style>");
	
	
	/**
	 * Function to allow column resizing for table objects. It is the starting point to apply the plugin.
	 * @param {DOM node} tb - reference to the DOM table object to be enhanced
	 * @param {Object} options    - some customization values
	 */
	var init = function (tb, options) {
		var t = $(tb);				    //the table object is wrapped
		t.opt = options;                //each table has its own options available at anytime
		t.mode = options.resizeMode;    //shortcuts
		t.dc = t.opt.disabledColumns;
		//if(t.opt.disable) return destroy(t);				//the user is asking to destroy a previously colResized table
		if (t.opt.disable) destroy(t);				//the user is asking to destroy a previously colResized table
		var id = t.id = t.attr(ID) || SIGNATURE + count++;	//its id is obtained, if null new one is generated
		t.p = t.opt.postbackSafe; 							//short-cut to detect postback safe
		if (!t.is("table") || tables[id] && !t.opt.partialRefresh) return; 		//if the object is not a table or if it was already processed then it is ignored.
		if (t.opt.hoverCursor !== 'e-resize') h.append("<style type='text/css'>.JCLRgrip .JColResizer:hover{cursor:" + t.opt.hoverCursor + "!important}</style>");  //if hoverCursor has been set, append the style
		t.addClass(SIGNATURE).attr(ID, id).before('<div class="JCLRgrips"/>');	//the grips container object is added. Signature class forces table rendering in fixed-layout mode to prevent column's min-width
		t.g = [];
		t.c = [];
		t.w = t.width();
		t.gc = t.prev();
		t.f = t.opt.fixed;	//t.c and t.g are arrays of columns and grips respectively
		if (options.marginLeft) t.gc.css("marginLeft", options.marginLeft);  	//if the table contains margins, it must be specified
		if (options.marginRight) t.gc.css("marginRight", options.marginRight);  	//since there is no (direct) way to obtain margin values in its original units (%, em, ...)
		t.cs = I(ie ? tb.cellSpacing || tb.currentStyle.borderSpacing : t.css('border-spacing')) || 2;	//table cellspacing (not even jQuery is fully cross-browser)
		t.b = I(ie ? tb.border || tb.currentStyle.borderLeftWidth : t.css('border-left-width')) || 1;	//outer border width (again cross-browser issues)
		// if(!(tb.style.width || tb.width)) t.width(t.width()); //I am not an IE fan at all, but it is a pity that only IE has the currentStyle attribute working as expected. For this reason I can not check easily if the table has an explicit width or if it is rendered as "auto"
		tables[id] = t; 	//the table object is stored using its id as key
		createGrips(t);		//grips are created
		
	};
	
	
	/**
	 * This function allows to remove any enhancements performed by this plugin on a previously processed table.
	 * @param {jQuery ref} t - table object
	 */
	var destroy = function (t) {
		var id = t.attr(ID), t = tables[id];		//its table object is found
		if (t && t.is("table")) {////if none, then it wasn't processed
			t.removeClass(SIGNATURE + " " + FLEX).gc.remove();	//class and grips are removed
			delete tables[id];						//clean up data
		}
		;
		
	};
	
	
	/**
	 * Function to create all the grips associated with the table given by parameters
	 * @param {jQuery ref} t - table object
	 */
	var createGrips = function (t) {
		
		var th = t.find(">thead>tr:first>th,>thead>tr:first>td"); //table headers are obtained
		if (!th.length) th = t.find(">tbody>tr:first>th,>tr:first>th,>tbody>tr:first>td, >tr:first>td");	 //but headers can also be included in different ways
		th = th.filter(":visible");					//filter invisible columns
		t.cg = t.find("col"); 						//a table can also contain a colgroup with col elements
		t.ln = th.length;							//table length is stored
		//if(t.p && S && S[t.id])memento(t,th);		//if 'postbackSafe' is enabled and there is data for the current table, its coloumn layout is restored
		th.each(function (i) {						//iterate through the table column headers
			var c = $(this); 						//jquery wrap for the current column
			var dc = t.dc.indexOf(i) != -1;           //is this a disabled column?
			var g = $(t.gc.append('<div class="JCLRgrip"></div>')[0].lastChild); //add the visual node to be used as grip
			g.append(dc ? "" : t.opt.gripInnerHtml).append('<div class="' + SIGNATURE + '"></div>');
			if (i == t.ln - 1) {                        //if the current grip is the las one
				g.addClass("JCLRLastGrip");         //add a different css class to stlye it in a different way if needed
				if (t.f) g.html("");                 //if the table resizing mode is set to fixed, the last grip is removed since table with can not change
			}
			g.bind('touchstart mousedown', onGripMouseDown); //bind the mousedown event to start dragging
			
			if (!dc) {
				//if normal column bind the mousedown event to start dragging, if disabled then apply its css class
				g.removeClass('JCLRdisabledGrip').bind('touchstart mousedown', onGripMouseDown);
			} else {
				g.addClass('JCLRdisabledGrip');
			}
			
			g.t = t;
			g.i = i;
			g.c = c;
			c.w = c.width();		//some values are stored in the grip's node data as shortcut
			t.g.push(g);
			t.c.push(c);						//the current grip and column are added to its table object
			c.width(c.w).removeAttr("width");				//the width of the column is converted into pixel-based measurements
			g.data(SIGNATURE, {i: i, t: t.attr(ID), last: i == t.ln - 1});	 //grip index and its table name are stored in the HTML
		});
		t.cg.removeAttr("width");	//remove the width attribute from elements in the colgroup
		
		t.find('td, th').not(th).not('table th, table td').each(function () {
			$(this).removeAttr('width');	//the width attribute is removed from all table cells which are not nested in other tables and dont belong to the header
		});
		if (!t.f) {
			t.removeAttr('width').addClass(FLEX); //if not fixed, let the table grow as needed
		}
		syncGrips(t); 				//the grips are positioned according to the current table layout
		//there is a small problem, some cells in the table could contain dimension values interfering with the
		//width value set by this plugin. Those values are removed
		
	};
	
	
	/**
	 * Function to allow the persistence of columns dimensions after a browser postback. It is based in
	 * the HTML5 sessionStorage object, which can be emulated for older browsers using sessionstorage.js
	 * @param {jQuery ref} t - table object
	 * @param {jQuery ref} th - reference to the first row elements (only set in deserialization)
	 */
	var memento = function (t, th) {
		var w, m = 0, i = 0, aux = [], tw;
		if (th) {										//in deserialization mode (after a postback)
			t.cg.removeAttr("width");
			if (t.opt.flush) {
				S[t.id] = "";
				return;
			} 	//if flush is activated, stored data is removed
			w = S[t.id].split(";");					//column widths is obtained
			tw = w[t.ln + 1];
			if (!t.f && tw) {							//if not fixed and table width data available its size is restored
				t.width(tw *= 1);
				if (t.opt.overflow) {				//if overfolw flag is set, restore table width also as table min-width
					t.css('min-width', tw + PX);
					t.w = tw;
				}
			}
			for (; i < t.ln; i++) {						//for each column
				aux.push(100 * w[i] / w[t.ln] + "%"); 	//width is stored in an array since it will be required again a couple of lines ahead
				th.eq(i).css("width", aux[i]); 	//each column width in % is restored
			}
			for (i = 0; i < t.ln; i++)
				t.cg.eq(i).css("width", aux[i]);	//this code is required in order to create an inline CSS rule with higher precedence than an existing CSS class in the "col" elements
		} else {							//in serialization mode (after resizing a column)
			S[t.id] = "";				//clean up previous data
			for (; i < t.c.length; i++) {	//iterate through columns
				w = t.c[i].width();		//width is obtained
				S[t.id] += w + ";";		//width is appended to the sessionStorage object using ID as key
				m += w;					//carriage is updated to obtain the full size used by columns
			}
			S[t.id] += m;							//the last item of the serialized string is the table's active area (width),
			//to be able to obtain % width value of each columns while deserializing
			if (!t.f) S[t.id] += ";" + t.width(); 	//if not fixed, table width is stored
		}
	};
	
	
	/**
	 * Function that places each grip in the correct position according to the current table layout
	 * @param {jQuery ref} t - table object
	 */
	var syncGrips = function (t) {
		t.gc.width(t.w);			//the grip's container width is updated
		for (var i = 0; i < t.ln; i++) {	//for each column
			var c = t.c[i];
			t.g[i].css({			//height and position of the grip is updated according to the table layout
				left: c.offset().left - t.offset().left + c.outerWidth(false) + t.cs / 2 + PX,
				height: t.opt.headerOnly ? t.c[0].outerHeight(false) : t.outerHeight(false)
			});
		}
	};
	
	
	/**
	 * This function updates column's width according to the horizontal position increment of the grip being
	 * dragged. The function can be called while dragging if liveDragging is enabled and also from the onGripDragOver
	 * event handler to synchronize grip's position with their related columns.
	 * @param {jQuery ref} t - table object
	 * @param {number} i - index of the grip being dragged
	 * @param {bool} isOver - to identify when the function is being called from the onGripDragOver event
	 */
	var syncCols = function (t, i, isOver) {
		debugger
		var inc = drag.x - drag.l, c = t.c[i], c2 = t.c[i + 1];
		var w = c.w + inc;
		var w2 = c2.w - inc;	//their new width is obtained
		//c.width( w + PX);
		c.css({"min-width": (w + PX)});
		c.css({"width": (w + PX)});
		//t.cg.eq(i).width( w + PX);
		//t.cg.eq(i).css({"min-width":(w + PX)});
		if (t.f) { //if fixed mode
			//c2.width(w2 + PX);
			//t.cg.eq(i+1).width( w2 + PX);
		} else if (t.opt.overflow) {				//if overflow is set, incriment min-width to force overflow
			//t.css('min-width', t.w + inc);
		}
		if (isOver) {
			c.w = w;
			c2.w = t.f ? w2 : c2.w;
		}
	};
	
	
	/**
	 * This function updates all columns width according to its real width. It must be taken into account that the
	 * sum of all columns can exceed the table width in some cases (if fixed is set to false and table has some kind
	 * of max-width).
	 * @param {jQuery ref} t - table object
	 */
	var applyBounds = function (t) {
		var w = $.map(t.c, function (c) {			//obtain real widths
			return c.width();
		});
		t.width(t.w = t.width()).removeClass(FLEX);	//prevent table width changes
		$.each(t.c, function (i, c) {
			c.width(w[i]).w = w[i];				//set column widths applying bounds (table's max-width)
		});
		t.addClass(FLEX);						//allow table width changes
	};
	
	
	/**
	 * Event handler used while dragging a grip. It checks if the next grip's position is valid and updates it.
	 * @param {event} e - mousemove event binded to the window object
	 */
	var onGripDrag = function (e) {
		if (!drag) return;
		var t = drag.t;		//table object reference
		var oe = e.originalEvent.touches;
		var ox = oe ? oe[0].pageX : e.pageX;    //original position (touch or mouse)
		var x = ox - drag.ox + drag.l;	        //next position according to horizontal mouse position increment
		var mw = t.opt.minWidth, i = drag.i;	//cell's min width
		var l = t.cs * 1.5 + mw + t.b;
		var last = i == t.ln - 1;                 			//check if it is the last column's grip (usually hidden)
		var min = i ? t.g[i - 1].position().left + t.cs + mw : l;	//min position according to the contiguous cells
		var max = t.f ? 	//fixed mode?
			i == t.ln - 1 ?
				t.w - l :
				t.g[i + 1].position().left - t.cs - mw :
			Infinity; 								//max position according to the contiguous cells
		x = M.max(min, M.min(max, x));				//apply bounding
		drag.x = x;
		drag.css("left", x + PX); 	//apply position increment
		if (last) {									//if it is the last grip
			var c = t.c[drag.i];					//width of the last column is obtained
			drag.w = c.w + x - drag.l;
		}
		if (t.opt.liveDrag) { 			//if liveDrag is enabled
			if (last) {
				c.width(drag.w);
				if (!t.f && t.opt.overflow) {			//if overflow is set, incriment min-width to force overflow
					t.css('min-width', t.w + x - drag.l);
				} else {
					t.w = t.width();
				}
			} else {
				syncCols(t, i); 			//columns are synchronized
			}
			syncGrips(t);
			var cb = t.opt.onDrag;							//check if there is an onDrag callback
			if (cb) {
				e.currentTarget = t[0];
				cb(e);
			}		//if any, it is fired
		}
		return false; 	//prevent text selection while dragging
	};
	
	
	/**
	 * Event handler fired when the dragging is over, updating table layout
	 * @param {event} e - grip's drag over event
	 */
	var onGripDragOver = function (e) {
		
		d.unbind('touchend.' + SIGNATURE + ' mouseup.' + SIGNATURE).unbind('touchmove.' + SIGNATURE + ' mousemove.' + SIGNATURE);
		$("head :last-child").remove(); 				//remove the dragging cursor style
		if (!drag) return;
		drag.removeClass(drag.t.opt.draggingClass);		//remove the grip's dragging css-class
		if (!(drag.x - drag.l == 0)) {
			var t = drag.t;
			var cb = t.opt.onResize; 	    //get some values
			var i = drag.i;                 //column index
			var last = i == t.ln - 1;         //check if it is the last column's grip (usually hidden)
			var c = t.g[i].c;               //the column being dragged
			if (last) {
				c.width(drag.w);
				c.w = drag.w;
			} else {
				syncCols(t, i, true);	//the columns are updated
			}
			//if(!t.f) applyBounds(t);	//if not fixed mode, then apply bounds to obtain real width values
			syncGrips(t);				//the grips are updated
			if (cb) {
				e.currentTarget = t[0];
				cb(e, drag, t.c[i]);
			}	//if there is a callback function, it is fired
			if (t.p && S) memento(t); 	//if postbackSafe is enabled and there is sessionStorage support, the new layout is serialized and stored
		}
		drag = null;   //since the grip's dragging is over
	};
	
	
	/**
	 * Event handler fired when the grip's dragging is about to start. Its main goal is to set up events
	 * and store some values used while dragging.
	 * @param {event} e - grip's mousedown event
	 */
	var onGripMouseDown = function (e) {
		var o = $(this).data(SIGNATURE);			//retrieve grip's data
		var t = tables[o.t], g = t.g[o.i];			//shortcuts for the table and grip objects
		var oe = e.originalEvent.touches;           //touch or mouse event?
		g.ox = oe ? oe[0].pageX : e.pageX;            //the initial position is kept
		g.l = g.position().left;
		g.x = g.l;
		
		d.bind('touchmove.' + SIGNATURE + ' mousemove.' + SIGNATURE, onGripDrag).bind('touchend.' + SIGNATURE + ' mouseup.' + SIGNATURE, onGripDragOver);	//mousemove and mouseup events are bound
		h.append("<style type='text/css'>*{cursor:" + t.opt.dragCursor + "!important}</style>"); 	//change the mouse cursor
		g.addClass(t.opt.draggingClass); 	//add the dragging class (to allow some visual feedback)
		drag = g;							//the current grip is stored as the current dragging object
		if (t.c[o.i].l) for (var i = 0, c; i < t.ln; i++) {
			c = t.c[i];
			c.l = false;
			c.w = c.width();
		} 	//if the colum is locked (after browser resize), then c.w must be updated
		return false; 	//prevent text selection
	};
	
	
	/**
	 * Event handler fired when the browser is resized. The main purpose of this function is to update
	 * table layout according to the browser's size synchronizing related grips
	 */
	var onResize = function () {
		for (var t in tables) {
			if (tables.hasOwnProperty(t)) {
				t = tables[t];
				var i, mw = 0;
				t.removeClass(SIGNATURE);   //firefox doesn't like layout-fixed in some cases
				if (t.f) {                  //in fixed mode
					t.w = t.width();        //its new width is kept
					for (i = 0; i < t.ln; i++) mw += t.c[i].w;
					//cell rendering is not as trivial as it might seem, and it is slightly different for
					//each browser. In the beginning i had a big switch for each browser, but since the code
					//was extremely ugly now I use a different approach with several re-flows. This works
					//pretty well but it's a bit slower. For now, lets keep things simple...
					for (i = 0; i < t.ln; i++) t.c[i].css("width", M.round(1000 * t.c[i].w / mw) / 10 + "%").l = true;
					//c.l locks the column, telling us that its c.w is outdated
				} else {     //in non fixed-sized tables
					applyBounds(t);         //apply the new bounds
					if (t.mode == 'flex' && t.p && S) {   //if postbackSafe is enabled and there is sessionStorage support,
						memento(t);                     //the new layout is serialized and stored for 'flex' tables
					}
				}
				syncGrips(t.addClass(SIGNATURE));
			}
		}
		
	};
	
	
	//bind resize event, to update grips position
	$(window).bind('resize.' + SIGNATURE, onResize);
	
	
	/**
	 * The plugin is added to the jQuery library
	 * @param {Object} options -  an object that holds some basic customization values
	 */
	$.fn.extend({
		colResizable: function (options) {
			var defaults = {
				
				//attributes:
				
				resizeMode: 'fit',                    //mode can be 'fit', 'flex' or 'overflow'
				draggingClass: 'JCLRgripDrag',	//css-class used when a grip is being dragged (for visual feedback purposes)
				gripInnerHtml: '',				//if it is required to use a custom grip it can be done using some custom HTML
				liveDrag: false,				//enables table-layout updating while dragging
				minWidth: 40, 					//minimum width value in pixels allowed for a column
				headerOnly: false,				//specifies that the size of the the column resizing anchors will be bounded to the size of the first row
				hoverCursor: "e-resize",  		//cursor to be used on grip hover
				dragCursor: "e-resize",  		//cursor to be used while dragging
				postbackSafe: false, 			//when it is enabled, table layout can persist after postback or page refresh. It requires browsers with sessionStorage support (it can be emulated with sessionStorage.js).
				flush: false, 					//when postbakSafe is enabled, and it is required to prevent layout restoration after postback, 'flush' will remove its associated layout data
				marginLeft: null,				//in case the table contains any margins, colResizable needs to know the values used, e.g. "10%", "15em", "5px" ...
				marginRight: null, 				//in case the table contains any margins, colResizable needs to know the values used, e.g. "10%", "15em", "5px" ...
				disable: false,					//disables all the enhancements performed in a previously colResized table
				partialRefresh: false,			//can be used in combination with postbackSafe when the table is inside of an updatePanel,
				disabledColumns: [],            //column indexes to be excluded
				
				//events:
				onDrag: null, 					//callback function to be fired during the column resizing process if liveDrag is enabled
				onResize: null					//callback function fired when the dragging process is over
			}
			var options = $.extend(defaults, options);
			
			//since now there are 3 different ways of resizing columns, I changed the external interface to make it clear
			//calling it 'resizeMode' but also to remove the "fixed" attribute which was confusing for many people
			options.fixed = true;
			options.overflow = false;
			switch (options.resizeMode) {
				case 'flex':
					options.fixed = false;
					break;
				case 'overflow':
					options.fixed = false;
					options.overflow = true;
					break;
			}
			
			return this.each(function () {
				init(this, options);
			});
		}
	});
})(jQuery);
